URL Extraction - Filtering

[jjackson37]

Once the URLs have been retrieved from the RegEx they will most likely need to be filtered.
I think seperating out the filters into their own classes would be the best approach here, I can then create objects of them in a collection and loop the URL collection through them all.

I can think of two filters that we need so far :

1. Error/Incorrect URLs (Possible it might need to run this one before the incomplete URL building?)
2. URLs that link to different domains

• Create filter data structure and interface
• Create media file filter
• Create duplicate address filter
• Create domain URL filter
• Create error URLs filter
• Create 404 filter (Not sure about this one yet)

[BoggartBear]

3. Filter out unnecessary media content such as images, videos, and sound files.

The list of types could be managed in a config for now?

[BoggartBear]

4. Filter out pages that are unresponsive (resulting in 404 etc) though this could be an expensive process.

[jjackson37]

The above commit 450be63 actually references #2 not this issue

[BoggartBear]

Pushed duplicate and media removal filters under 5706d93

We need configs to store the media types to remove.